Installing mechanical oil pressure gauge in 1988 Toyota Tercel
I have a 1988 Toyota Tercel EZ with a 1.5 l4 engine and would like to install an oil pressure gauge. I've reviewed the instructions contained in the $17 gauge kit from the local auto parts store, but I still am not sure where the sending unit for the stock oil pressure sensor is located. Apparently, the feed for the mechanical gauge needs to be installed in the same location.
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First test the engine oil pressure by removing the sending unit and temporarily installing a mechanical oil gauge. Run the engine and note pressure. Raise the engine speed to approximately 2000 rpm. The pressure should be 40 to 50 pounds------------------------------------------------------------------------------ XPROG-M V5.0
Yes, you do. Also be sure and set the engine at TDC of compression stroke of # 1 cylinder. Remove crank bolt and pulley, remove timing cover...you may also have to remove the front engine mount to get the cover off. Use a jack and a piece of wood under the oil pan to hold the engine up.
It means your oil pressure is too low to safely run engine. Causes might be a worn oil pump, a failed oil pump gasket, clogged oil passages from sludge, or badly worn crankshaft bearings. If your toyota is not burning oil, or very little, I would take a look at the oil pump on your engine. After removal, they can be checked (and repaired) with a feeler gauge for proper working condition, but most people just replace with new. If you want to be certain about the pressure reading, you can check pressure with a mechanic's oil pressure gauge. You have to run the engine just long enough to get a good reading on the pressure gauge, a moment or two.
Sounds like the timing belt broke or has spun teeth. To check that to the following: Remove the disrtibutor cap and then have someone crank the engine while you watch the distributor rotor.
If the rotor is turning the timing belt is still good. If not then that's your problem.You need a new timing belt.
If the engine is not making any noise.It is probably the oil sending unit that is defective.If you want to be sure you will have to install a pressure gauge and check the pressure when the vehicle is at normal operating temperature.If it is above 10 psi then replace the sending unit.It is located on the back of the motor on the block by the left cylinder head.You might need a special socket for it.Hope this helps.Good luck.
The oil pressure sending unit is a sensor with an internal diaphragm, if the internal diaphragm is damaged , or the line to the diaphragm is blocked you can get this kind of fluctuation on the oil pressure gauge.
The oil pressure value must be read by installing a mechanical gauge near to the oil pressure switch and checking the pressure.
If pressure is ok, replace the sending unit. If there is a real pressure drop, check the oil pump.
If you still get fluctualtion after replacing the oil pressure sending unit, replace the oil pressure gauge.